Fork @iov/socket (#250)

* socket: Fork @iov/socket

* socket: Remove nonces

* socket: Update package.json

* socket: Update README

* socket: Remove tslint

* socket: Fix lint warnings

* scripts: Fork socketserver from IOV Core

* root: Update NOTICE for socket

* tendermint-rpc: Replace @iov/socket dependency with @cosmjs/socket

* root: Update CI config for tendermint/socket

* scripts: Add wait to tendermint start script

* socket: Add coverage

scripts/socketserver/echo.py

@@ -0,0 +1,50 @@
+#!/usr/bin/env python3
+#pylint:disable=missing-docstring,invalid-name
+
+import argparse
+import asyncio
+import websockets
+import sys
+import time
+
+HOST = "0.0.0.0"
+
+def log(data):
+    print(data, flush=True)
+
+@asyncio.coroutine
+def connection_handler(connection, path):
+    connection_id = hex(id(connection))
+    log("{} opened connection via {}".format(connection_id, path))
+    try:
+        while True:
+            incoming_message = yield from connection.recv()
+            log("< {}".format(incoming_message))
+            outgoing_message = incoming_message
+            yield from connection.send(outgoing_message)
+            log("> {}".format(outgoing_message))
+    except websockets.exceptions.ConnectionClosed:
+        log("{} closed connection".format(connection_id))
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--port",
+        help="Port to listen on",
+        type=int,
+        default=4000)
+    parser.add_argument("--delay",
+        help="Time in seconds that a connection will be delayed before establishing it",
+        type=int,
+        default=0)
+    args = parser.parse_args()
+
+    def delaying_process_request(path, request_headers):
+        time.sleep(args.delay)
+        return None
+
+    log("Starting server at {}:{}".format(HOST, args.port))
+    server = websockets.serve(connection_handler, HOST, args.port, process_request=delaying_process_request)
+    log("Running now.")
+
+    asyncio.get_event_loop().run_until_complete(server)
+    asyncio.get_event_loop().run_forever()